using System;

using Org.BouncyCastle.Asn1.X509;
using Org.BouncyCastle.Math;

namespace Org.BouncyCastle.Asn1.Pkcs
{
	public class IssuerAndSerialNumber
		: Asn1Encodable
	{
		private readonly X509Name name;
		private readonly DerInteger certSerialNumber;

		public static IssuerAndSerialNumber GetInstance(
			object obj)
		{
			if (obj is IssuerAndSerialNumber)
			{
				return (IssuerAndSerialNumber) obj;
			}

			if (obj is Asn1Sequence)
			{
				return new IssuerAndSerialNumber((Asn1Sequence) obj);
			}

			throw new ArgumentException("Unknown object in factory: " + obj.GetType().FullName, "obj");
		}

		private IssuerAndSerialNumber(
			Asn1Sequence seq)
		{
			if (seq.Count != 2)
				throw new ArgumentException("Wrong number of elements in sequence", "seq");

			this.name = X509Name.GetInstance(seq[0]);
			this.certSerialNumber = DerInteger.GetInstance(seq[1]);
		}

		public IssuerAndSerialNumber(
			X509Name	name,
			BigInteger	certSerialNumber)
		{
			this.name = name;
			this.certSerialNumber = new DerInteger(certSerialNumber);
		}

		public IssuerAndSerialNumber(
			X509Name	name,
			DerInteger	certSerialNumber)
		{
			this.name = name;
			this.certSerialNumber = certSerialNumber;
		}

		public X509Name Name
		{
			get { return name; }
		}

		public DerInteger CertificateSerialNumber
		{
			get { return certSerialNumber; }
		}

		public override Asn1Object ToAsn1Object()
		{
			return new DerSequence(name, certSerialNumber);
		}
	}
}
